Laboratory tests of the pleural effusion indicated leakage fluid with the following results: light yellow turbid liquid, Rivalta test (+), total cells count 352 × 106, monocytes accounting for 72% of total white blood cells, white blood cell count 287 × 106, protein 31.6 g/L, glucose 12.55 mmol/L, LDH 111 U/L, and ADA 4 U/L. This evidence concerns the gene ADA and Pleural effusion.